611689680 has 120 divisors (see below), whose sum is σ = 2347742592. Its totient is φ = 139813632.

The previous prime is 611689657. The next prime is 611689691. The reversal of 611689680 is 86986116.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55644 + ... + 65723.

Almost surely, 2^611689680 is an apocalyptic number.

611689680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

611689680 is an abundant number, since it is smaller than the sum of its proper divisors (1736052912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611689680 is a wasteful number, since it uses less digits than its factorization.

611689680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121393 (or 121384 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 611689680 is about 24732.3609871763. The cubic root of 611689680 is about 848.8749498466.

The spelling of 611689680 in words is "six hundred eleven million, six hundred eighty-nine thousand, six hundred eighty".